iselect: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/iselect - from package: iselect

You may install the required package with command apt-get install {package}

Error in other languages:
iselect: bevel nie gevind nie
iselect: comandă negăsită
iselect: comando não encontrado
iselect: commande introuvable
iselect: command not found
iselect: käsku ei ole
iselect: không tìm thấy lệnh
iselect: komanda nerasta
iselect: Kommando nicht gefunden.
iselect: kommandot finns inte
iselect: komut yok
iselect: nie znaleziono polecenia
iselect: níor aimsíodh an t-ordú
iselect: no se encontró la orden
iselect: no s'ha trobat l'ordre
iselect: opdracht niet gevonden
iselect: parancs nem található
iselect: perintah tidak ditemukan
iselect: príkaz nenájdený
iselect: příkaz nenalezen
iselect: команда не найдена
iselect: командата не е открита
iselect: 命令找不到
iselect: コマンドが見つかりません